JavaScript weakMap.get() Method
Below is the example of weakMap.get()() method.
- Example:
<script>functiongfg() {const weakmap1 =newWeakMap();const key1 = {};weakmap1.set(key1, 12);document.write(weakmap1.get(key1));}gfg();</script>chevron_rightfilter_none - Output:
12
The weakMap.get() is an inbuilt function in JavaScript which is used to return a particular element from a object WeakMap.
Syntax:
weakMap.get(key);
Parameters: It accepts a parameter “key” which is the key of the element which is going to be returned from the object weakmap.
Return values: It returns the element which is associated with the particular key in the WeakMap object and it returns undefined if the key can not be found.
Example:
Input: weakmap1.get(key1) Output: 42
JavaScript code to show the working of weakmap() function:
Code #1:
<script> // Creating a WeakMap() object const weakmap1 = new WeakMap(); // Creating a key "key1" const key1 = {}; // setting value 42 with key "key1" in the // object weakMap weakmap1.set(key1, 42); // Getting the specified elements i.e, 42 document.write(weakmap1.get(key1)); </script> |
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Output:
42
Code #2:
<script> // Creating a WeakMap() object const weakmap1 = new WeakMap(); // Creating a key "key1" const key1 = {}; // Getting the specified elements document.write(weakmap1.get(key1)); </script> |
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Output:
undefined
Here output is undefined because the key “key1” has not been set at the end of the weakMap object.
Supported Browsers:
- Google Chrome
- Internet Explorer
- Firefox
- Apple Safari
- Opera
